移动通信系统中分集技术的分析.doc

论文题目：移动通信系统中分集技术的分析 专 业： 学 生： 签 名：_____________ 指导教师： 签 名：_____________ 摘要 本文第1章介绍了移动通信的基本概念，其中包括他的定义，工作方式，信道特点及无线信道的信号传播方式，同时提到了蜂窝移动通信系统。 由于移动环境的复杂性,无线信号在发送传输和接收过程中有很明显的衰落现象。而分集技术是一种主要的抗衰落技术，它可以大大提高多径衰落信道下的传输可靠性，本文第2，3章通过分集接收技术的介绍分析以及分集接收技术在移动通信特别是第三代移动通信中的应用,介绍了传统RAKE 接收机和WCDMA 中采用的典型RAKE 接收机。并且通过针对系统采用MPSK调制情况下，对合并方式性能进行了分析比较，得出MRC性能最好，EGC性能稍差，而SC性能较差的结论。 空时编码技术，可以大幅度地提高无线通信系统的信息容量和传输速率，并能有效抵制多径衰落、抑制噪声和干扰。本文第4章着重讨论了空时分层编码，研究了它的模型，编码算法和译码算法，并得出了相应的结论。 【关键词】:分集接收;第3代移动通信系统；RAKE ;空时编码技术； 【论文类型】： 理论研究 Title: mobile communication systems diversity technology analysis Major: communications technologies Name: signature: _____________ Supervisor: signature: _____________ ABSTRACT This paper introduced chapter 1 the basic concept of mobile communication, including his definition, work methods and channel characteristics and wireless channels signal propagation mode, Also mentioned the cellular mobile communication system . Due to the complexity of the mobile environment, the wireless signals in sending transmission and reception in the process to have obviously decline phenomena. And diversity technology is a major fight decline technology, it can greatly improve the multipath fading channel, the transmission reliability，This paper first two or three chapters through diversity of receiving technique introduction and analysis of receiving technique and diversity in the mobile communication especially the third generation mobile communication application, this paper introduces the traditional RAKE receiver and WCDMA RAKE receiver adopted in the typical. Space-time coding technology, can greatly improve wireless communication system information capacity and transmission rate, and can effectively resist multipath fading, reduce the noise and interference. This paper focuses on the discussion in chapter 4, layered coding space-time of its model, coding algorithm and decoding algorithm, and draws a conclusion. 【 key words 】diversit